Negative charges repel positive charges. t/f if a negatively charged rod is brought close to an electroscope that is negatively charged, the two leaves will move farther apart. t/f electrical charges exist in the sea and in the air. t/f coulomb's law describes gravitational attraction t/f an insulator does not allow electrons to flow freely through it. t/f coulomb's law predicts that charged bodies may attract or repel each other. t/f electric fields have magnitude and direction. t/f an electric field is a measure of the force on a unit positive charge. t/f

If the demand function for a commodity is given by the equation p2 + 16q = 1200 and the supply function is given by the equation 300 − p2 + 2q = 0, find the equilibrium quantity and equilibrium price. (round your answers to two decimal places.)

He acceleration due to gravity on the surface of mars is about one third the acceleration due to gravity on earth’s surface. the weight of a space probe on the surface of mars is about

Tornadoes form in unusually violent thunderstorms when there is sufficient (1) instability and (2) wind shear present in the lower atmosphere. elaborate on what does instability mean when discussing the formation of a tornado? a) dry air in the middle atmosphere being rapidly cooled by rain b) winds at all levels of the atmosphere are strong and turn with height c) an isolated strong thunderstorm just ahead of a squall line that merges with the squall line d) very warm, humid conditions in the lower atmosphere; cooler than usual conditions in the upper atmosphere